Vacuum induction furnace

Abstract

The utility model provides a vacuum induction furnace, which belongs to the technical field of metallurgy and comprises a vacuum induction furnace body and a siphon deslagging device arranged on the vacuum induction furnace body. The siphon deslagging device comprises a slag collecting and separating device and a deslagging channel; the slag collecting and separating device is arranged at the upper part of a molten pool of the vacuum induction furnace body; the deslagging channel comprises an inner channel vertically arranged in the side wall of a heating crucible of the vacuum induction furnace body, a transition channel communicated with the lower part of the inner channel and an outer channel connected with an outer port of the transition channel; the lower part of the outer channel is communicated with the outer port of the transition channel; and the pressure at the slag inlet at the upper part of the inner channel is greater than that at the slag outlet at the upper part of the outer channel. According to the utility model, the problems that in the metal smelting process of the vacuum induction furnace in the prior art, the slag is difficult to discharge, the slag and the gold are mixed out and the slag is difficult to continuously discharge under the vacuum condition due to poor fluidity of the slag and difficult separation of the slag and the gold can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metallurgical technique field more specifically, relate to a kind of vacuum induction furnace. BACKGROUND

[0002] Metal smelting, such as magnesium smelting technology, is mainly electrolytic method and silicon hot method. Among them, the electrolytic method has long raw material preparation process, produces a large amount of chlorine gas / sludge by electrolysis, and has high investment in processing by-products and sludge, thus causing burden to magnesium production. Typical silicon hot method has Magnesium process and Pidgeon process, the former realizes continuous reaction of raw materials under liquid slag, the method has high reduction efficiency and short reduction time, but the problem of vacuum sealing of high-temperature electrode has not been solved, safety is not good, and cost is not superior. Pidgeon process has simple process equipment, low investment and low cost, so the crude magnesium produced by Pidgeon process accounts for more than 80% of the total magnesium output. However, Pidgeon process has problems of high energy consumption, low resource utilization efficiency, serious environmental pollution, inability to realize mechanized and automated production, and high carbon emission intensity.

[0003] In view of the above problems existing in magnesium smelting process, it is an urgent requirement to develop an efficient, environmentally friendly, low-cost and energy-saving raw magnesium smelting process and equipment to realize industrial upgrading, transformation and structural adjustment, and it is also a demand of green development. Therefore, based on the transplanted steelmaking equipment RH, single nozzle refining furnace and VD technology, a method of vacuum liquid injection smelting magnesium (or other metals) is developed. The method obtains finished product by injecting reduced calcined white powder into excess reduced silicon-iron liquid, and the whole smelting process is continuously supplemented with reduced silicon-iron liquid through a feeding channel. If the slag can be continuously discharged through a slag discharge channel, continuous production of magnesium (or other metals) smelting can be realized, which will be a completely new process. The method has good thermodynamic and kinetic conditions, high reaction speed, and the production capacity of a single equipment is higher than that of Magnesium, the reduction temperature is significantly lower than that of Magnesium process, and the cost estimation is lower than that of Pidgeon process. However, there is no suitable and effective slag discharge method for continuous discharge of liquid slag and slag-gold separation under vacuum condition. For example, the existing patent CN111270088B discloses a system and method for inductively heating liquid stirring continuous magnesium smelting, which provides a scheme for realizing continuous magnesium smelting by inductively heating liquid stirring, but does not specifically give the design of the slag discharge system. Patent CN117588946A discloses a continuous steel tapping induction melting furnace, which gives the system design of continuous steel tapping of induction furnace under atmosphere, but does not consider the sealing of continuous steel tapping process, so it is not suitable for continuous slag discharge under vacuum condition.

[0004] In summary, the method of vacuum liquid injection smelting metal in the prior art has problems of difficult slag discharge, slag-gold mixing and difficulty in continuous discharge of molten slag under vacuum condition due to poor flowability of molten slag and difficulty in separation of slag-gold.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. Content of the present application

[0006] In view of the above problems, the purpose of the present application is to provide a vacuum induction furnace to solve the problems of poor slag flowability, difficulty in slag-gold separation, slag-gold mixing and difficulty in continuous slag discharge under vacuum conditions in the existing technology of vacuum liquid injection smelting metal scheme.

[0007] The present application provides a vacuum induction furnace, comprising: a vacuum induction furnace body and a siphon slag discharge device arranged on the vacuum induction furnace body; wherein,

[0008] The siphon slag discharge device comprises a molten slag collecting and separating device and a slag discharge channel;

[0009] The molten slag collecting and separating device is arranged on the upper part of the molten pool of the vacuum induction furnace body, and comprises a molten slag collecting bucket, a metal liquid separation port arranged at the bottom of the molten slag collecting bucket, and a molten slag separation port arranged on the side wall of the molten slag collecting bucket;

[0010] The slag discharge channel comprises an inner channel vertically arranged inside the side wall of the heating crucible of the vacuum induction furnace body, a transition channel in communication with the lower part of the inner channel, and an outer channel connected with the outer port of the transition channel; wherein,

[0011] The lower end of the inner channel passes through the heating crucible and is arranged in the vacuum space of the vacuum induction furnace body; the inner port of the transition channel is in communication with the lower end of the inner channel, the outer port is horizontally and upwardly inclined and passes through the vacuum space, and is arranged outside the vacuum induction furnace body; the outer channel is vertically arranged, the lower part is in communication with the outer port of the transition channel, and the upper part is connected with a downwardly inclined discharge pipe; the pressure at the upper slag inlet of the inner channel is greater than the pressure at the upper slag outlet of the outer channel;

[0012] A first heating device is arranged on the outer side wall of the transition channel; a second heating device is arranged on the outer side wall of the outer channel;

[0013] A first heat preservation material layer is arranged outside the first heating device; a second heat preservation material layer is arranged outside the second heating device.

[0014] Further, preferably, a first lower port is arranged at the lower end of the inner channel, and a first sealing cover is arranged at the first lower port; and / or a second lower port is arranged at the lower end of the outer channel, and a second sealing cover is arranged at the second lower port; and / or an upper port is arranged at the upper end of the outer channel, and a third sealing cover is arranged at the upper port; and / or a fourth sealing cover is arranged at the discharge port of the discharge pipe.

[0015] Further, preferably, a first refractory material blocking structure is arranged inside the first lower port; and / or a second refractory material blocking structure is arranged inside the second lower port; and / or a third refractory material blocking structure is arranged inside the upper port of the outer channel.

[0016] Further, preferably, the angle between the outer port of the transition channel and the horizontal plane is 10-20°.

[0017] Further, preferably, the first heating device is a first silicon molybdenum heating rod; and / or the second heating device is a second silicon molybdenum heating rod.

[0018] Further, preferably, the molten slag collecting and separating device is arranged at a position 50-100 mm above the molten slag liquid level in the molten pool.

[0019] Further, preferably, a mobile slag storage device is arranged below the discharge port of the discharge pipe.

[0020] Further, preferably, the mobile slag storage device comprises a slag tank arranged below the discharge port of the discharge pipe and a slag tank car arranged below the slag tank.

[0021] Further, preferably, the transition channel and the outer channel each comprise, from inside to outside, a graphite slag discharge channel layer, an insulation material layer and a steel structure layer.

[0022] Further, preferably, a high-temperature-resistant adhesive layer is arranged between the insulation material layer and the steel structure layer of the transition channel and between the insulation material layer and the steel structure layer of the outer channel.

[0023] From the above technical solutions can be known, the vacuum induction furnace provided by the utility model, through the molten slag collecting and separating device arranged on the upper part of the molten pool of the vacuum induction furnace body, the smelting slag generated in the molten pool is collected and slag-gold is separated, the separated molten slag enters the slag discharge channel from the molten slag separating port on the side wall of the molten slag collecting bucket, the inner channel and the outer channel are communicated by the transition channel, the pressure at the upper slag inlet of the inner channel is greater than the pressure at the upper slag outlet of the outer channel, because the pressure difference is generated between the molten slag in the inner channel and the slag outlet of the outer channel, that is, the molten slag entering the slag discharge channel is continuously discharged by using the siphon principle, the first heating device is used for heating the transition channel, the second heating device is used for heating the outer channel, so that the temperature of the slag discharge channel is kept at the preset slag discharge temperature, the flowability of the high-viscosity molten slag in the slag discharge channel is ensured, so that the slag-gold separation and the continuous discharge of the molten slag under the vacuum condition are realized, the problems of the difficulty in slagging, the slag-gold mixing and the difficulty in continuously discharging the molten slag under the vacuum condition caused by the poor flowability of the molten slag and the difficulty in separating the slag-gold in the metal smelting process of the vacuum induction furnace in the prior art are effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Other objects and advantages of the present application can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0025] Figure 1 FIG. 1 is a structural schematic view of a vacuum induction furnace according to an embodiment of the present application;

[0026] Figure 2 FIG. 3 is a partial structural schematic view of an inner channel according to an embodiment of the present application;

[0027] Figure 3 FIG. 4 is a structural schematic view of a molten slag collecting and separating device according to an embodiment of the present application;

[0028] Figure 4 FIG. 5 is a flow chart of metal vacuum smelting using the vacuum induction furnace according to an embodiment of the present application.

[0029] In the drawings, 1 - slag collection separation device, 11 - slag collection bucket, 12 - molten metal separation port, 13 - slag separation port, 21 - inner channel, 22 - transition channel, 23 - outer channel, 24 - discharge pipe, 25 - first heating device, 26 - second heating device, 27 - first heat insulation material layer, 28 - second heat insulation material layer, 31 - vacuum system, 32 - vacuum space, 33 - vacuum shell, 34 - induction coil, 35 - heating crucible, 36 - molten pool, 361 - slag, 362 - metal melt, 37 - feeding channel, 41 - first sealing cover, 42 - second sealing cover, 43 - third sealing cover, 44 - fourth sealing cover, 51 - first refractory material plugging structure, 52 - second refractory material plugging structure, 53 - third refractory material plugging structure, 61 - slag ladle, 62 - slag ladle car.

[0030] The same reference numbers in all the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0031] In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It is apparent, however, that the embodiments can be practiced without these specific details.

[0032] For the foregoing, in the prior art, the vacuum liquid injection smelting metal scheme has the problems of difficult slag discharge, slag-metal mixing and difficult continuous slag discharge under vacuum conditions due to poor slag flowability and difficult slag-metal separation.

[0033] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0034] In order to illustrate the vacuum induction furnace provided by the present application, Figure 1 The structure of the vacuum induction furnace according to the embodiment of the present application is shown; Figure 2 The partial structure of the inner channel according to the embodiment of the present application is shown; Figure 3 The structure of the slag collection separation device according to the embodiment of the present application is shown; Figure 4 The process of metal vacuum smelting using the vacuum induction furnace according to the embodiment of the present application is shown.

[0035] As Figures 1 to 3 The vacuum induction furnace provided by the present application, as shown in the drawings, comprises a vacuum induction furnace body and a siphon slag discharge device arranged on the vacuum induction furnace body; wherein,

[0036] The siphon slag discharge device comprises a slag collection separation device 1 and a slag discharge channel;

[0037] The slag collecting and separating device 1 is arranged at the upper portion of the molten pool 36 of the vacuum induction furnace body, and comprises a slag collecting bucket 11, a molten metal separating port 12 arranged at the bottom of the slag collecting bucket 11, and a slag separating port 13 arranged on the side wall of the slag collecting bucket 11;

[0038] The slag outlet channel comprises an inner channel 21 vertically arranged in the inner side wall of the heating crucible 35 of the vacuum induction furnace body, a transition channel 22 in communication with the lower portion of the inner channel 21, and an outer channel 23 connected with the outer port of the transition channel 22; wherein,

[0039] The lower end of the inner channel 21 penetrates through the heating crucible 35 and is arranged in the vacuum space 32 of the vacuum induction furnace body; the inner port of the transition channel 22 is in communication with the lower end of the inner channel 21, and the outer port is horizontally and upwardly inclined and arranged outside the vacuum induction furnace body and penetrates through the vacuum space 32; the outer channel 23 is vertically arranged, the lower portion is in communication with the outer port of the transition channel 22, and the upper portion is connected with a downwardly inclined discharge pipe 24; the pressure at the upper portion of the inner channel 21 is greater than the pressure at the upper portion of the outer channel 23;

[0040] The first heating device 25 is arranged on the outer side wall of the transition channel 22; and the second heating device 26 is arranged on the outer side wall of the outer channel 23;

[0041] The first heat preservation material layer 27 is arranged outside the first heating device 25; and the second heat preservation material layer 28 is arranged outside the second heating device 26.

[0042] The heat preservation material layer arranged outside the heating device can achieve the heat preservation effect of the slag outlet channel.

[0043] It should be noted that the vacuum induction furnace body in the utility model can adopt the mature equipment in the prior art, and generally comprises a vacuum space 32 surrounded by a vacuum shell 33, a vacuum connecting hole is formed in the vacuum shell 33 to be connected with a vacuum system 31, so that the internal space of the vacuum shell 33 forms the vacuum space 32. The heating crucible 35 is arranged in the vacuum space 32, the induction coil 34 is arranged outside the heating crucible 35, the vertical feeding channel 37 is arranged on the inner side wall of the heating crucible 35 to feed the metal raw material into the interior of the heating crucible 35 from the outside, the heating crucible 35 is heated and smelted by the induction coil 34, so that the metal raw material in the interior of the heating crucible 35 is heated and melted to form the molten pool 36, the top of the molten pool 36 is the slag 361, and the lower portion of the slag 361 is the metal melt 362.

[0044] The smelted slag in the utility model refers to the slag with the metal melt.

[0045] Preferably, but not limited to, the heating crucible 35 is a graphite crucible, and the heating effect is good.

[0046] The feeding channel 37 and the inner channel 21 are vertically arranged inside the sidewall of the heating crucible 35. The outer channel 23 is vertically arranged outside the vacuum induction furnace.

[0047] The slagging channel in the technical scheme of the utility model realizes continuous slagging by using siphon principle, and by controlling continuous feeding speed, the molten slag is separated, and then the molten slag height in the inner channel 21 of the slagging channel and the pressure difference at the outlet of the outer channel 23 are utilized to continuously discharge the molten slag from the furnace to the outside, wherein the specific settings of the molten slag height of the inner channel 21 and the height of the slagging outlet in the outer channel 23 (namely the discharge outlet of the outer channel 23 and the discharge pipe 24) and the channel diameter can be calculated according to Bernoulli equation, wherein the Bernoulli equation is:

[0048]

[0049] Q≤πr 2 ·V1;

[0050] Wherein Z1 is the height of the slagging outlet of the outer channel 23, V1 is the slagging flow rate of the slagging outlet of the outer channel 23, Z0 is the height of the inner channel 21 (the molten slag height in the inner channel 21), V0 is the slagging flow rate of the inner channel 21, the units of Z1 and Z0 are m, the units of V1 and V0 are m / s, P0 and P1 are respectively the inner and outer pressure of the vacuum induction furnace, the units are Pa, ρ is the density of the molten slag, the unit is kg / m 3 ; g is the acceleration of gravity, the unit is m / s 2 ; h w is the total pressure loss of the slagging channel, the unit is Pa; Q is the slagging amount per unit time, the unit is m 3 / s; r is the radius of the inner channel 21 and the outer channel 23, the units are m, and the radius of the inner channel 21 and the outer channel 23 is the same.

[0051] The molten slag generated in the molten pool 36 is collected and slag-gold separated by the slag collecting and separating device 1 arranged at the upper part of the molten pool 36 of the vacuum induction furnace body, the separated molten slag enters the slag discharge channel from the slag separation opening 13 on the side wall of the slag collecting bucket 11, and the inner channel 21 and the outer channel 23 are communicated by the transition channel 22, and the molten slag entering the slag discharge channel is continuously discharged by the pressure difference between the molten slag in the inner channel 21 and the slag discharge opening of the outer channel 23, that is, by the siphon principle; the inner channel 21 is heated by the inductive coil 34 arranged around the outer periphery of the heating crucible 35, the transition channel 22 is heated by the first heating device 25, and the outer channel 23 is heated by the second heating device 26, so that the temperature of the slag discharge channel is kept at a preset slag discharge temperature, the flowability of the high-viscosity molten slag in the slag discharge channel is ensured, and the slag-gold separation and continuous discharge of the molten slag under vacuum condition are realized; and the problems of difficult slag discharge, slag-gold mixed discharge and difficult continuous discharge of the molten slag under vacuum condition caused by poor flowability of the molten slag and difficult slag-gold separation in the metal smelting process by the vacuum induction furnace in the prior art are effectively solved.

[0052] As a preferred scheme of the present application, a first lower port is arranged at the lower end of the inner channel 21, a first sealing cover 41 is arranged at the first lower port; and / or a second lower port is arranged at the lower end of the outer channel 23, a second sealing cover 42 is arranged at the second lower port; and / or an upper port is arranged at the upper end of the outer channel 23, a third sealing cover 43 is arranged at the upper port; and / or a fourth sealing cover 44 is arranged at the discharge port of the discharge pipe 24.

[0053] By arranging the ports and the sealing covers, the residual molten slag in the slag discharge channel can be conveniently cleaned.

[0054] It should be noted that during the metal vacuum smelting, the ports of the slag discharge channel need to be sealed by the sealing covers to ensure the vacuum degree in the system during the start-up or shutdown period.

[0055] As a preferred scheme of the present application, a first refractory material plugging structure 51 is arranged inside the first lower port; and / or a second refractory material plugging structure 52 is arranged inside the second lower port; and / or a third refractory material plugging structure 53 is arranged inside the upper port of the outer channel 23.

[0056] The main function of the refractory material plugging structure is to plug the channel and prevent the high-temperature slag from directly contacting the sealing cover and damaging the sealing cover.

[0057] As a preferred scheme of the present application, the inclination angle between the outer port of the transition channel 22 and the horizontal plane is 10-20°.

[0058] By setting the inclination angle between the outer port of the transition channel 22 and the horizontal plane to 10-20°, excessive liquid slag can be avoided from remaining in the pipeline during shutdown.

[0059] As a preferred embodiment of the present application, the first heating device 25 is a first silicon-molybdenum heating rod, and / or the second heating device 26 is a second silicon-molybdenum heating rod.

[0060] It should be noted that the first heating device 25 and the second heating device 26 are preferably but not limited to silicon-molybdenum heating rods, and other devices capable of achieving the same heating effect can be used for replacement, which is not particularly limited in the present application.

[0061] As a preferred embodiment of the present application, the slag collecting and separating device 1 is arranged at a position 50-100 mm higher than the liquid slag level in the molten pool 36.

[0062] Specifically, the slag collecting and separating device 1 collects the smelting slag by using the surge and spatter of the smelting slag during the smelting slag collecting process. The smelting slag collected into the slag collecting bucket 11 still contains metal liquid (metal melt), and the collected smelting slag is separated into slag and metal melt by using the metal liquid separation port 12 and the slag separation port 13, so that the metal liquid in the slag collecting bucket 11 returns to the molten pool 36 from the metal liquid separation port 12 at the bottom thereof, and the slag enters the inner channel 21 from the slag separation port 13 on the side wall thereof.

[0063] It should be noted that the slag collecting and separating device 1 arranged at a position 50-100 mm higher than the liquid slag level in the molten pool 36 is a preferred embodiment of the present application, and the height of the slag collecting and separating device 1 can be determined according to the actual surge or spatter height of the smelting slag in actual application, which is not particularly limited in the present application.

[0064] As a preferred embodiment of the present application, a mobile slag storage device is arranged below the discharge port of the discharge pipe 24.

[0065] As a preferred embodiment of the present application, the mobile slag storage device comprises a slag tank 61 arranged below the discharge port of the discharge pipe 24 and a slag tank car 62 arranged below the slag tank 61.

[0066] The mobile slag storage device facilitates the storage and transportation of the smelting slag.

[0067] As a preferred embodiment of the present application, the transition channel 22 and the outer channel 23 each comprise, from inside to outside, a graphite slag discharge channel layer, a heat preservation material layer and a steel structure layer.

[0068] The side walls of the transition channel 22 and the outer channel 23 each comprise, from inside to outside, a graphite layer, a heat preservation material layer and a steel structure layer in sequence, so as to reduce the heat loss of the smelting slag in the channels during the slag discharge operation.

[0069] As a preferred scheme of the utility model, high-temperature resistant adhesive layers are arranged between the heat insulation material layers and the steel structure layers of the transition channel 22 and the outer channel 23.

[0070] By arranging the high-temperature resistant adhesive layers between the heat insulation material layers and the steel structure layers of the transition channel 22 and the outer channel 23, the cracking of the steel structure layers of the transition channel 22 and the outer channel 23 due to the different thermal expansion coefficients in the heating and cooling process during the start-up or shutdown of the furnace is prevented, and the system sealing property is damaged.

[0071] As shown in Figure 4 The process of vacuum induction furnace for metal vacuum smelting using the utility model embodiment includes the following steps:

[0072] Step S1, the metal to be smelted is added into the heating crucible 35 of the vacuum induction furnace body, the induction coil 34 arranged around the outside of the heating crucible 35 is used to heat the heating crucible 35, so that the metal in the heating crucible 35 is smelted into a liquid state, and a molten pool is formed in the heating crucible 35;

[0073] Step S2, the smelting slag generated in the molten pool 36 is collected by the slag collection and separation device 1, and the collected smelting slag is separated into molten slag and metal melt by using the metal liquid separation port 12 and the molten slag separation port 13, so that the separated molten slag enters the slag discharge channel from the molten slag separation port 13;

[0074] Step S3, the induction coil 34 arranged around the periphery of the heating crucible 35 is used to heat the inner channel 21, the first heating device 25 is used to heat the transition channel 22, and the second heating device 26 is used to heat the outer channel 23, so that the temperature of the slag discharge channel is kept at a preset slag discharge temperature, and the high-viscosity molten slag is continuously discharged from the vacuum induction furnace body;

[0075] Step S4, the metal in the heating crucible is smelted to a preset requirement, and the smelting of the metal to be smelted is completed.

[0076] As a preferred scheme of the utility model, the preset slag discharge temperature is 1450-1500 DEG C.

[0077] It should be noted that: the preset slag discharge temperature is preferably but not limited to 1450-1500 DEG C, and can be limited according to the actual metal slag temperature that keeps fluidity. For most metal slag, 1450-1500 DEG C can ensure the fluidity of the molten slag.

[0078] It can be seen from the above specific embodiment that the vacuum induction furnace provided by the utility model, through the molten slag collecting and separating device arranged on the upper part of the molten pool of the vacuum induction furnace body, the smelting slag generated in the molten pool is collected and slag-gold is separated, the separated molten slag enters the slag discharge channel from the molten slag separating port on the side wall of the molten slag collecting bucket, the inner channel and the outer channel are communicated by the transition channel, because the pressure difference is generated between the molten slag in the inner channel and the slag discharge port of the outer channel, that is, the molten slag entering the slag discharge channel is continuously discharged by using the siphon principle; the inner channel is heated by the inductive coil arranged around the outer periphery of the heating crucible, the transition channel is heated by the first heating device, and the outer channel is heated by the second heating device, so that the temperature of the slag discharge channel is kept at the preset slag discharge temperature, the flowability of the high-viscosity molten slag in the slag discharge channel is ensured, so that the slag-gold separation and the continuous discharge of the molten slag under the vacuum condition are realized; effectively solve the problem that in the prior art, the metal smelting process is carried out by using the vacuum induction furnace, because the molten slag has poor flowability, the slag-gold is not easy to separate, the slag discharge is difficult, the slag-gold is mixed, and the molten slag is difficult to be continuously discharged under the vacuum condition.

[0079] The vacuum induction furnace according to the utility model is described above with reference to the drawings in an exemplary manner. However, it should be understood by those skilled in the art that various improvements can be made to the above-mentioned vacuum induction furnace according to the utility model without departing from the content of the utility model. Therefore, the protection scope of the utility model should be determined by the content of the appended claims.

Claims

1. A vacuum induction furnace, characterized in that, The vacuum induction furnace comprises a vacuum induction furnace body and a siphon slagging device arranged on the vacuum induction furnace body; wherein, the siphon slagging device comprises a molten slag collecting and separating device and a slagging channel; the molten slag collecting and separating device is arranged at the upper part of the molten pool of the vacuum induction furnace body, and comprises a molten slag collecting bucket, a molten metal separating port arranged at the bottom of the molten slag collecting bucket, and a molten slag separating port arranged on the sidewall of the molten slag collecting bucket; the slagging channel comprises an inner channel vertically arranged in the sidewall of the heating crucible of the vacuum induction furnace body, a transition channel in communication with the lower part of the inner channel, and an outer channel connected with the outer port of the transition channel; wherein, the lower end of the inner channel penetrates through the heating crucible and is arranged in the vacuum space of the vacuum induction furnace body; the inner port of the transition channel is in communication with the lower end of the inner channel, and the outer port is horizontally and upwardly arranged and penetrates through the vacuum space and is arranged outside the vacuum induction furnace body; the outer channel is vertically arranged, the lower part is in communication with the outer port of the transition channel, and the upper part is connected with a downwardly inclined discharge pipe; the pressure at the upper slagging port of the outer channel is greater than the pressure at the upper slagging port of the outer channel; a first heating device is arranged on the outer sidewall of the transition channel; and a second heating device is arranged on the outer sidewall of the outer channel; a first heat preservation material layer is arranged outside the first heating device; and a second heat preservation material layer is arranged outside the second heating device.

2. The vacuum induction furnace according to claim 1, wherein, a first lower port is arranged at the lower end of the inner channel, and a first sealing cover is arranged at the first lower port; and / or, a second lower port is arranged at the lower end of the outer channel, and a second sealing cover is arranged at the second lower port; and / or, an upper port is arranged at the upper end of the outer channel, and a third sealing cover is arranged at the upper port; and / or, a fourth sealing cover is arranged at the discharge port of the discharge pipe.

3. The vacuum induction furnace according to claim 2, wherein, a first refractory material plugging structure is arranged inside the first lower port; and / or, a second refractory material plugging structure is arranged inside the second lower port; and / or, a third refractory material plugging structure is arranged inside the upper port of the outer channel.

4. The vacuum induction furnace according to claim 1, wherein, the inclination angle between the outer port of the transition channel and the horizontal plane is 10-20°.

5. The vacuum induction furnace according to claim 1, wherein, the first heating device is a first silicon molybdenum heating rod; and / or, the second heating device is a second silicon molybdenum heating rod.

6. The vacuum induction furnace according to claim 1, wherein, the molten slag collecting and separating device is arranged at a position 50-100 mm higher than the molten slag liquid level in the molten pool.

7. The vacuum induction furnace according to claim 1, wherein, a moving slag storage device is arranged below the discharge port of the discharge pipe.

8. The vacuum induction furnace according to claim 7, wherein, ​ The mobile residue storage device comprises a residue tank arranged below the discharge opening of the discharge pipe and a residue tank vehicle arranged below the residue tank.

9. The vacuum induction furnace according to claim 1, characterized in that, The transition channel and the outer channel each comprise, from inside to outside, a graphite residue discharge channel layer, a thermal insulation material layer and a steel structure layer.

10. The vacuum induction furnace according to claim 9, characterized in that, A high-temperature-resistant adhesive layer is arranged between the thermal insulation material layer and the steel structure layer of the transition channel and between the thermal insulation material layer and the steel structure layer of the outer channel.

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